You really need to update your sig!
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TSA-102, SW ED-80, C10N | G11 | QHY8 | Ethos17, Powermate 4x
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You have taken some awesome shots with the TEC.
How did you combine the 60 and 30 min subs? As Jase said, a sum will do the trick (better than mean or median I'm guessing) Or you could normalize by multiplying the 30 subs x 2 with pixel math.
James